So as an fyi - I picked up a 1TB Samsung 860 EVO SSD from Amazon for US$145
I too picked up a couple of Evo 860's a couple of months ago, they are really nice drives. Samsung provides their own cloning software which everybody including me says that when cloning from X drive to a Samsung SSD you can't go wrong with it.
I decided to upgrade my old 840's in my i7 laptops (one laptop is about 18 months old and the other is about 12 months old) to the newer and faster 860. Using the spec sheet the speed difference is not that much. When When using in a real world situation I can easily tell the speed difference between the two drives.
My old 840 drives are now being used for backup purposes on my linux server. I actually have a couple of spare 500GB Samsung SSD drives that I've not used in a while, I will use them for something useful in the near future though.
The Samsung migration software has never fail myself, my clients or my friends when I recommend to them to purchase a Samsung drive and use the Samsung cloning software to clone their current c drive over to their new Samsung drive, I always tell them to clean up their old drives first, oldofiles, cache files, temp files and folders etc.
Cloning my old
Samsung 840 SSDs to my new
860 SSDs via an external USB caddy, 125 MB/S is not too bad.
Enjoy...